Relies on renewal configuration file generated by certbot instead of
using explicit arguments

Maps DNS configuration folder if DNS challenge has been used during
setup

HTTP challenges remains the default challenge.
DNS challenges must be configured explicitly.

Introduces specific configuration folder for DNS
Generates configuration files (for all) and required certbot hooks (for AWS only)
Relies on official cerbot images with DNS plugins
Allows usage of custom images (for advanced users only)

So that it is possible to deal with Let's encrypt certificates when
targeting setup-ssl

Remove appservice database setup/config as the latest update no longer requires it.

This is probably a continuation of changes made in d7ed672f7.

.. instead of `['']`.

The final result in the `env` file will be the same (`POSTMOOGLE_ADMINS=`)
in both cases, but it's better to avoid confusion.

This is done in anticipation of this option's removal in the
upcoming Synapse v1.66.0 release (likely tomorrow).

See: https://matrix-org.github.io/synapse/v1.66/upgrade.html#delegation-of-email-validation-no-longer-supported

We do this for all other supported homeservers.

A "public by default" homeserver is a bad idea for most people.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2076

* postmoogle: add admins

* postmoogle: update jija2 defaults

* postmoogle: fix typo

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2068

Possibly fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2060

Regression since 3f8cb96a18 - https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2048

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2057

Regression since the mass-replace in 34cdaade0.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2054

* appservice: add and use matrix_homeserver_* vars

* appservice: use the new vars

* Apply suggestions from code review

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Before this, it was trying to pull the `latest` git branch.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2043

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

Related to https://github.com/jitsi/docker-jitsi-meet/issues/1377

Adding this doesn't really help though. `stable-7648-2` is broken
regardless. `stable-7648-3` is necessary to make it work.

We're already updated to `-3` anyway. This just adds the missing
environment variable for completeness.